Explosion-engine.



No. 731,507. PATENTED JUNE 23, 1903. K. SCHAFFERKOTTER.

EXPLOSION ENGINE. APPLICATION rum) JUNE 2a, 1902.

6'2" I r f UNITED STATES Patented June 23, 1903.

FFICE.

PATENT EXPLOSION-ENGINE.

SPECIFICATION forming part of Letters Patent N 0. 731,507, dated June23,1903. Application filed June 28, 1902. Serial No. 118,637. (Nomodel.)

To all whom it may concern.-

Be it known that I, KARL SoHAEEERKoT- TER, a subject of the Emperor ofGermany,

residing at Priim, Trier, Prussia, Germany, have invented certainImprovements in Explosion-Engines, of which the following is aspecification.

In explosion-engines after a long stop the inconvenience arises that thecold air in the cylinder of the machine prevents the explosive mixturefrom readily entering the said cylinder when said machine is to bestarted. This invention affords means and comprises a device forevacuating said cylinder, so that the air is drawn out and the mixtureis readily received within the vacuum.

The accompanying drawing illustrates the invention by a diagrammaticalview of the device.

In the construction of .my invention I use an ordinary air-pump a, whichis connected by a pipe I), having two branches 0 c, to

both ends of the cylinder cl of the motor,

thus providing means for evacuating the air on both sides of the pistone. The purpose in view in having the pipe I) branched for communicatingwith both ends of the cylinder is to allow complete evacuation of thesaid cylinder for obtaining a ready working of the piston therein whenthe latter is operated. Valves f and f on said two branches adjacent tothe cylinder normally close the pipe and its branches from saidcylinder. The said valves are opened and closed by means of two arms gand g, which are parallely connected with each other by two bars h h,pivoted thereto, so as to guide said arms parallely to each other. Anon-return valve 2' is inserted at the lower end of the air-pump abetween said pump and pipe I), and a clackvalve 7.: in the piston ofsaid pump allows the air to be discharged therethrough when the pump isoperated.

It will be clear that the hereinbefore-described device is supplementalto the normal admission and exhaust ports (shown at land I) and isindependent thereof.

The operation of this device is as follows:

When the machine is to be started, the valves ff are opened by liftingthe bar h, which may be secured in the lifted position in any suitablemanner. (See the position as indicated in dotted lines.) Now the air isevacuated from the cylinder by operating the air-pump, whereby theexplosive mixture is compelled to readily enter the cylinder, so that afailure of ignition is excluded.

It will be clear that in self-propelled vehicles the bar It and the pipeI) may be easily so formed and arranged that the device may be operatedfrom the drivers seat, thus affording means for insuring the operationof the engine at all times and to set the latter in motion with theleast possible loss of time.

Having now described my invention, I claim- 1. In an explosion-engine,the combination with the motor-cylinder having the normal admission andexhaust ports of an air-pump, a pipe connection between said pump andboth ends of said cylinder, valves for opening and closing said pipeconnection adjacent to said cylinder, which valves are independent ofsaid normal admission and exhaust means and supplemental thereto, andmeans for operating said valves, substantially as described.

2. In an explosion-engine, the combination with the motor-cylinderhaving the normal admission andexhaust ports of an air-pump, a pipeconnection between said pump and both ends of said cylinder, valves foropening and closing said pipe connection, said valves being supplementalto said admission and exhaust means, and a non-return valve between saidpump and pipe, a clack-valve in the piston of said pump and means forsimultaneously operating said valves in the pipe connectionindependently of said admission and exhaust means, substantially as andfor the purpose described.

KARL soHAEEERKoTTER.

Witnesses:

JOHN B. ADAMS, FRANK M. BRUNDAGE.

